How to Spot a Fake SmileThe one facial cue that reveals authentic emotion.

From the show

Reading People Signals

Learn to distinguish a genuine expression of happiness from a polite social gesture. While a social, or 'fake,' smile only engages the muscles around the mouth, a genuine Duchenne smile is involuntary and involves the entire face. The secret lies in the orbicularis oculi muscles around the eyes. Their contraction creates 'crow's feet,' a telltale sign that someone's positive feelings are authentic. By paying attention to the eyes, you can better read people's true emotions.